“…Examples of research conducted on topics that model some of the complexities of verbal behavior are studies of contextual control (e.g., Bush, Sidman & de Rose, 1989;Lynch & Green, 1991;Markham & Dougher, 1993;Meehan & Fields, 1995;Pérez-González, 1991;Pérez-González & Martínez-Sánchez, 2007;Pérez-González & Serna, 1993a, 1993b, 2003Pérez-González, Spradlin, & Saunders, 2000;Roche & Barnes, 1996Serna, 1991;Serna & Pérez-González, 1994, 2003Wulfert & Hayes, 1988; see theoretical analyses in Sidman, 1986Sidman, , 1994, relations among relations and stimuli (e.g. Carpentier, Smeets, & BarnesHolmes, 2000, 2002a, 2002bJunior & Costa, 2003;Junior, Costa, Gonsales, & Golfeto, 2001;Pérez-González, 1994), studies on relations between relations, or analogical reasoning (Pérez-González, Herszlikowicz, & Williams, 2008;Stewart, Barnes-Holmes, Roche, & Smeets, 2001, 2002, and comparative relations ''more'' and ''less'' (Dymond & Barnes, 1995.…”